/* NullCipherImpl.java -- implementation of NullCipher. Copyright (C) 2004 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ package javax.crypto; import java.security.AlgorithmParameters; import java.security.Key; import java.security.SecureRandom; import java.security.spec.AlgorithmParameterSpec; /** * Implementation of the identity cipher. */ final class NullCipherImpl extends CipherSpi { // Constructor. // ------------------------------------------------------------------------- NullCipherImpl() { super(); } // Instance methods. // ------------------------------------------------------------------------- protected void engineSetMode(String mode) { } protected void engineSetPadding(String padding) { } protected int engineGetBlockSize() { return 1; } protected int engineGetOutputSize(int inputLen) { return inputLen; } protected byte[] engineGetIV() { return null; } protected AlgorithmParameters engineGetParameters() { return null; } protected void engineInit(int mode, Key key, SecureRandom random) { } protected void engineInit(int mode, Key key, AlgorithmParameterSpec spec, SecureRandom random) { } protected void engineInit(int mode, Key key, AlgorithmParameters params, SecureRandom random) { } protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen) { if (input == null) return new byte[0]; if (inputOffset < 0 || inputLen < 0 || inputOffset + inputLen > input.length) throw new ArrayIndexOutOfBoundsException(); byte[] output = new byte[inputLen]; System.arraycopy(input, inputOffset, output, 0, inputLen); return output; } protected int engineUpdate(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws ShortBufferException { if (input == null) return 0; if (inputOffset < 0 || inputLen < 0 || inputOffset + inputLen > input.length || outputOffset < 0) throw new ArrayIndexOutOfBoundsException(); if (output.length - outputOffset < inputLen) throw new ShortBufferException(); System.arraycopy(input, inputOffset, output, outputOffset, inputLen); return inputLen; } protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen) { return engineUpdate(input, inputOffset, inputLen); } protected int engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws ShortBufferException { return engineUpdate(input, inputOffset, inputLen, output, outputOffset); } }